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memcg, slab: kmem_cache_create_memcg(): fix memleak on fail path 

We do not free the cache's memcg_params if __kmem_cache_create fails.
Fix this.

Plus, rename memcg_register_cache() to memcg_alloc_cache_params(),
because it actually does not register the cache anywhere, but simply
initialize kmem_cache::memcg_params.

[akpm@linux-foundation.org: fix build]
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Glauber Costa <glommer@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vladimir Davydov 2014-01-23 15:52:56 -08:00 committed by Linus Torvalds
parent 3965fc3652
commit 363a044f73
3 changed files with 19 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
include/linux/memcontrol.h
View File

@ -497,8 +497,9 @@ void __memcg_kmem_commit_charge(struct page *page,
void __memcg_kmem_uncharge_pages(struct page *page, int order); void __memcg_kmem_uncharge_pages(struct page *page, int order);
int memcg_cache_id(struct mem_cgroup *memcg); int memcg_cache_id(struct mem_cgroup *memcg);
int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s, int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s,
struct kmem_cache *root_cache); struct kmem_cache *root_cache);
void memcg_free_cache_params(struct kmem_cache *s);
void memcg_release_cache(struct kmem_cache *cachep); void memcg_release_cache(struct kmem_cache *cachep);
void memcg_cache_list_add(struct mem_cgroup *memcg, struct kmem_cache *cachep); void memcg_cache_list_add(struct mem_cgroup *memcg, struct kmem_cache *cachep);
@ -640,13 +641,16 @@ static inline int memcg_cache_id(struct mem_cgroup *memcg)
return -1; return -1;
} }
static inline int static inline int memcg_alloc_cache_params(struct mem_cgroup *memcg,
memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s, struct kmem_cache *s, struct kmem_cache *root_cache)
struct kmem_cache *root_cache)
{ {
return 0; return 0;
} }
static inline void memcg_free_cache_params(struct kmem_cache *s)
{
}
static inline void memcg_release_cache(struct kmem_cache *cachep) static inline void memcg_release_cache(struct kmem_cache *cachep)
{ {
} }

11
mm/memcontrol.c
View File

@ -3231,8 +3231,8 @@ int memcg_update_cache_size(struct kmem_cache *s, int num_groups)
return 0; return 0;
} }
int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s, int memcg_alloc_cache_params(struct mem_cgroup *memcg, struct kmem_cache *s,
struct kmem_cache *root_cache) struct kmem_cache *root_cache)
{ {
size_t size; size_t size;
@ -3260,6 +3260,11 @@ int memcg_register_cache(struct mem_cgroup *memcg, struct kmem_cache *s,
return 0; return 0;
} }
void memcg_free_cache_params(struct kmem_cache *s)
{
kfree(s->memcg_params);
}
void memcg_release_cache(struct kmem_cache *s) void memcg_release_cache(struct kmem_cache *s)
{ {
struct kmem_cache *root; struct kmem_cache *root;
@ -3288,7 +3293,7 @@ void memcg_release_cache(struct kmem_cache *s)
css_put(&memcg->css); css_put(&memcg->css);
out: out:
kfree(s->memcg_params); memcg_free_cache_params(s);
} }
/* /*

3
mm/slab_common.c
View File

@ -205,7 +205,7 @@ kmem_cache_create_memcg(struct mem_cgroup *memcg, const char *name, size_t size,
if (!s->name) if (!s->name)
goto out_free_cache; goto out_free_cache;
err = memcg_register_cache(memcg, s, parent_cache); err = memcg_alloc_cache_params(memcg, s, parent_cache);
if (err) if (err)
goto out_free_cache; goto out_free_cache;
@ -235,6 +235,7 @@ out_unlock:
return s; return s;
out_free_cache: out_free_cache:
memcg_free_cache_params(s);
kfree(s->name); kfree(s->name);
kmem_cache_free(kmem_cache, s); kmem_cache_free(kmem_cache, s);
goto out_unlock; goto out_unlock;